US1686087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of refining iron and steel products
Assignee: Individual
•
Filing: 1925-11-30
•
Granted: 1928-10-02
•
Expires: 1945-11-30
Abstract
No abstract record available.
Inventors
- 👤 Charles W Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/072
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1931-10-02 | 1932-04-02 | 1932-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-10-02 | 1936-04-02 | 1936-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-10-02 | 1940-04-02 | 1940-10-02 | $7700.00 | Window Closed / Lapsed |